Q: A 15.75-g piece of iron absorbs 1086.75 J of heat energy, and its temperature changes from 25°C to 177°C. What is the specific heat capacity of iron?

$$0.46 \\ \mathrm{J} \\ \mathrm{g}^{-1} \\ ^\circ\mathrm{C}^{-1}$$

Q: A 1500.0 g piece of wood absorbs 6750 J of heat, and its temperature changes from 32°C to 57°C. What is the specific heat capacity of the wood?

$$0.18 \\ \mathrm{J} \\ \mathrm{g}^{-1} \\ ^\circ\mathrm{C}^{-1}$$

Q: If 100 grams of NO$$_2$$ vapor is mixed with 100 grams of CO$$_2$$ gas, and the total pressure of the mixture is 7.4 atm, what is the partial pressure of each gas? (Molar masses: NO$$_2 = 46 g/$$mol, CO$$_2 = 44 g/$$mol)

$$P_{NO_2$} = 3.7 \\ \mathrm{atm}, \\ P_{CO_2$} = 3.7 \\ \mathrm{atm}$$

Question 1

A 15.75-g piece of iron absorbs 1086.75 J of heat energy, and its temperature changes from 25°C to 177°C. What is the specific heat capacity of iron?

Accepted Answer

$$0.46 \ \mathrm{J} \ \mathrm{g}^{-1} \ ^\circ\mathrm{C}^{-1}$$

Question 2

How many joules of heat are needed to raise the temperature of 18.0 g of aluminum from 22°C to 55°C? (The specific heat of aluminum is $$0.90 \ \mathrm{J} \ \mathrm{g}^{-1} \ ^\circ\mathrm{C}^{-1})$$

Accepted Answer

$$536 \ \mathrm{J}$$

Question 3

A 1500.0 g piece of wood absorbs 6750 J of heat, and its temperature changes from 32°C to 57°C. What is the specific heat capacity of the wood?

Accepted Answer

$$0.18 \ \mathrm{J} \ \mathrm{g}^{-1} \ ^\circ\mathrm{C}^{-1}$$

Question 4

A sample of propane generates 104.8 kJ of heat. All of this heat is used to heat 500.0 g of water that was initially at 20°C. What is the final temperature of the water? ($$c = 4.18 \ \mathrm{J} \ \mathrm{g}^{-1} \ ^\circ\mathrm{C}^{-1})$$

Accepted Answer

$$70.2 \ ^\circ\mathrm{C}$$

Question 5

Given the reaction $$H_2(g$$) + $$Cl_2(g$$) \ ightarrow 2HCl(g) \ \Delta H = -184.6 \ \mathrm{kJ}$$, what is the enthalpy change associated with the formation of 5.67 mol HCl gas?

Accepted Answer

$$-523 \ \mathrm{kJ}$$

Question 6

What is the enthalpy change when 12.0 g of H$$_2$$ gas reacts with excess Cl$$_2$$ gas to form HCl?

Accepted Answer

$$-548 \ \mathrm{kJ}$$

Question 7

Using the following data, calculate $$\Delta H$$ for the reaction: $$3Fe(s) + 4H_2O(g) \ ightarrow Fe_3O_4(s) + 4H_2(g)$$

Given:
$$Fe_3O_4(s) + 4H_2(g) \ ightarrow 3Fe(s) + 4H_2O(g) \ \Delta H = +824 \ \mathrm{kJ}$$

Accepted Answer

$$-824 \ \mathrm{kJ}$$

Question 8

How many sigma and pi bonds are present in the following molecule (aspirin)?

Accepted Answer

21 sigma, 7 pi

Question 9

Which of the following molecules has a trigonal pyramidal molecular geometry according to VSEPR theory?

Accepted Answer

NH$$_3$$

Question 10

What is the correct formula for ammonium sulfate?

Accepted Answer

$$(NH_4$)_2SO_4$$

Question 11

What is the correct name for $$Fe_2$$($$SO_4)_3$?

Accepted Answer

Iron(III) sulfate

Question 12

If 75 grams of iron(III) bromide reacts with aluminum sulfate, how many grams of aluminum bromide will be produced? (Assume excess aluminum sulfate.)

Accepted Answer

$$13.2 \ \mathrm{g}$$

Question 13

What is the concentration of a phosphorous acid solution if 25 mL are neutralized by 45 mL of 4.5 M Mg(OH)$$_2$$ solution? (Assume the reaction is $$2H_3PO_3 + 3Mg(OH)_2 \rightarrow Mg_3$(PO_3$)_2 + 6H_2O)$$

Accepted Answer

$$12.1 \ \mathrm{M}$$

Question 14

A balloon contains 243 mL of CO$$_2 at 14$$°C. The pressure of the gas is 467 mmHg. How many grams of CO$$_2$$ are in the balloon? ($$R = 0.08206 \ \mathrm{L} \ \mathrm{atm} \ \mathrm{mol}^{-1} \ \mathrm{K}^{-1})$$

Accepted Answer

$$0.45 \ \mathrm{g}$$

Question 15

What is the empirical formula of a compound that consists of 89.14% Au and 10.86% O by mass?

Accepted Answer

Au$$_2O$_3$$

Question 16

A sample (3.568 g) contains 1.308 g of C, 0.346 g of H, 1.850 g of O, and its molar mass is 62 g/mol. What is the molecular formula of this substance?

Accepted Answer

C$$_2H$_4O$_2$$

Question 17

If 100 grams of NO$$_2$$ vapor is mixed with 100 grams of CO$$_2$$ gas, and the total pressure of the mixture is 7.4 atm, what is the partial pressure of each gas? (Molar masses: NO$$_2 = 46 g/$$mol, CO$$_2 = 44 g/$$mol)

Accepted Answer

$$P_{NO_2$} = 3.7 \ \mathrm{atm}, \ P_{CO_2$} = 3.7 \ \mathrm{atm}$$

General Chemistry I Final Exam Study Guide

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